Even the stingy insurances in two European countries I checked tend to pay for a service it if you're taking 3+ medicines, suggesting that it's cheaper in the long term for them, either by reducing cost from waste, cost from classic pharmacies, or by improving outcomes in ways that result in less treatment (or the company running it managed to convince the regulator to make it covered by mandatory insurance because it's beneficial for patients).

When I was taking several different medications, I started seeing why this service would be useful, even as a relatively organized, non-impaired person.